/*
 * WL3501 Wireless LAN PCMCIA Card Driver for Linux
 * Written originally for Linux 2.0.30 by Fox Chen, mhchen@golf.ccl.itri.org.tw
 * Ported to 2.2, 2.4 & 2.5 by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
 * Wireless extensions in 2.4 by Gustavo Niemeyer <niemeyer@conectiva.com>
 *
 * References used by Fox Chen while writing the original driver for 2.0.30:
 *
 *   1. WL24xx packet drivers (tooasm.asm)
 *   2. Access Point Firmware Interface Specification for IEEE 802.11 SUTRO
 *   3. IEEE 802.11
 *   4. Linux network driver (/usr/src/linux/drivers/net)
 *   5. ISA card driver - wl24.c
 *   6. Linux PCMCIA skeleton driver - skeleton.c
 *   7. Linux PCMCIA 3c589 network driver - 3c589_cs.c
 *
 * Tested with WL2400 firmware 1.2, Linux 2.0.30, and pcmcia-cs-2.9.12
 *   1. Performance: about 165 Kbytes/sec in TCP/IP with Ad-Hoc mode.
 *      rsh 192.168.1.3 "dd if=/dev/zero bs=1k count=1000" > /dev/null
 *      (Specification 2M bits/sec. is about 250 Kbytes/sec., but we must deduct
 *       ETHER/IP/UDP/TCP header, and acknowledgement overhead)
 *
 * Tested with Planet AP in 2.4.17, 184 Kbytes/s in UDP in Infrastructure mode,
 * 173 Kbytes/s in TCP.
 *
 * Tested with Planet AP in 2.5.73-bk, 216 Kbytes/s in Infrastructure mode
 * with a SMP machine (dual pentium 100), using pktgen, 432 pps (pkt_size = 60)
 */

#include <linux/delay.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/in.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/fcntl.h>
#include <linux/if_arp.h>
#include <linux/ioport.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/wireless.h>
#include <linux/ieee80211.h>

#include <net/iw_handler.h>

#include <pcmcia/cistpl.h>
#include <pcmcia/cisreg.h>
#include <pcmcia/ds.h>

#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/system.h>

#include "wl3501.h"

#ifndef __i386__
#define slow_down_io()
#endif

/* For rough constant delay */
#define WL3501_NOPLOOP(n) { int x = 0; while (x++ < n) slow_down_io(); }



#define wl3501_outb(a, b) { outb(a, b); slow_down_io(); }
#define wl3501_outb_p(a, b) { outb_p(a, b); slow_down_io(); }
#define wl3501_outsb(a, b, c) { outsb(a, b, c); slow_down_io(); }

#define WL3501_RELEASE_TIMEOUT (25 * HZ)
#define WL3501_MAX_ADHOC_TRIES 16

#define WL3501_RESUME   0
#define WL3501_SUSPEND  1

static int wl3501_config(struct pcmcia_device *link);
static void wl3501_release(struct pcmcia_device *link);

static const struct {
        int reg_domain;
        int min, max, deflt;
} iw_channel_table[] = {
        {
                .reg_domain = IW_REG_DOMAIN_FCC,
                .min        = 1,
                .max        = 11,
                .deflt      = 1,
        },
        {
                .reg_domain = IW_REG_DOMAIN_DOC,
                .min        = 1,
                .max        = 11,
                .deflt      = 1,
        },
        {
                .reg_domain = IW_REG_DOMAIN_ETSI,
                .min        = 1,
                .max        = 13,
                .deflt      = 1,
        },
        {
                .reg_domain = IW_REG_DOMAIN_SPAIN,
                .min        = 10,
                .max        = 11,
                .deflt      = 10,
        },
        {
                .reg_domain = IW_REG_DOMAIN_FRANCE,
                .min        = 10,
                .max        = 13,
                .deflt      = 10,
        },
        {
                .reg_domain = IW_REG_DOMAIN_MKK,
                .min        = 14,
                .max        = 14,
                .deflt      = 14,
        },
        {
                .reg_domain = IW_REG_DOMAIN_MKK1,
                .min        = 1,
                .max        = 14,
                .deflt      = 1,
        },
        {
                .reg_domain = IW_REG_DOMAIN_ISRAEL,
                .min        = 3,
                .max        = 9,
                .deflt      = 9,
        },
};

/**
 * iw_valid_channel - validate channel in regulatory domain
 * @reg_comain - regulatory domain
 * @channel - channel to validate
 *
 * Returns 0 if invalid in the specified regulatory domain, non-zero if valid.
 */
static int iw_valid_channel(int reg_domain, int channel)
{
        int i, rc = 0;

        for (i = 0; i < ARRAY_SIZE(iw_channel_table); i++)
                if (reg_domain == iw_channel_table[i].reg_domain) {
                        rc = channel >= iw_channel_table[i].min &&
                             channel <= iw_channel_table[i].max;
                        break;
                }
        return rc;
}

/**
 * iw_default_channel - get default channel for a regulatory domain
 * @reg_comain - regulatory domain
 *
 * Returns the default channel for a regulatory domain
 */
static int iw_default_channel(int reg_domain)
{
        int i, rc = 1;

        for (i = 0; i < ARRAY_SIZE(iw_channel_table); i++)
                if (reg_domain == iw_channel_table[i].reg_domain) {
                        rc = iw_channel_table[i].deflt;
                        break;
                }
        return rc;
}

static void iw_set_mgmt_info_element(enum iw_mgmt_info_element_ids id,
                                     struct iw_mgmt_info_element *el,
                                     void *value, int len)
{
        el->id  = id;
        el->len = len;
        memcpy(el->data, value, len);
}

static void iw_copy_mgmt_info_element(struct iw_mgmt_info_element *to,
                                      struct iw_mgmt_info_element *from)
{
        iw_set_mgmt_info_element(from->id, to, from->data, from->len);
}

static inline void wl3501_switch_page(struct wl3501_card *this, u8 page)
{
        wl3501_outb(page, this->base_addr + WL3501_NIC_BSS);
}

/*
 * Get Ethernet MAC address.
 *
 * WARNING: We switch to FPAGE0 and switc back again.
 *          Making sure there is no other WL function beening called by ISR.
 */
static int wl3501_get_flash_mac_addr(struct wl3501_card *this)
{
        int base_addr = this->base_addr;

        /* get MAC addr */
        wl3501_outb(WL3501_BSS_FPAGE3, base_addr + WL3501_NIC_BSS); /* BSS */
        wl3501_outb(0x00, base_addr + WL3501_NIC_LMAL); /* LMAL */
        wl3501_outb(0x40, base_addr + WL3501_NIC_LMAH); /* LMAH */

        /* wait for reading EEPROM */
        WL3501_NOPLOOP(100);
        this->mac_addr[0] = inb(base_addr + WL3501_NIC_IODPA);
        WL3501_NOPLOOP(100);
        this->mac_addr[1] = inb(base_addr + WL3501_NIC_IODPA);
        WL3501_NOPLOOP(100);
        this->mac_addr[2] = inb(base_addr + WL3501_NIC_IODPA);
        WL3501_NOPLOOP(100);
        this->mac_addr[3] = inb(base_addr + WL3501_NIC_IODPA);
        WL3501_NOPLOOP(100);
        this->mac_addr[4] = inb(base_addr + WL3501_NIC_IODPA);
        WL3501_NOPLOOP(100);
        this->mac_addr[5] = inb(base_addr + WL3501_NIC_IODPA);
        WL3501_NOPLOOP(100);
        this->reg_domain = inb(base_addr + WL3501_NIC_IODPA);
        WL3501_NOPLOOP(100);
        wl3501_outb(WL3501_BSS_FPAGE0, base_addr + WL3501_NIC_BSS);
        wl3501_outb(0x04, base_addr + WL3501_NIC_LMAL);
        wl3501_outb(0x40, base_addr + WL3501_NIC_LMAH);
        WL3501_NOPLOOP(100);
        this->version[0] = inb(base_addr + WL3501_NIC_IODPA);
        WL3501_NOPLOOP(100);
        this->version[1] = inb(base_addr + WL3501_NIC_IODPA);
        /* switch to SRAM Page 0 (for safety) */
        wl3501_switch_page(this, WL3501_BSS_SPAGE0);

        /* The MAC addr should be 00:60:... */
        return this->mac_addr[0] == 0x00 && this->mac_addr[1] == 0x60;
}

/**
 * wl3501_set_to_wla - Move 'size' bytes from PC to card
 * @dest: Card addressing space
 * @src: PC addressing space
 * @size: Bytes to move
 *
 * Move 'size' bytes from PC to card. (Shouldn't be interrupted)
 */
static void wl3501_set_to_wla(struct wl3501_card *this, u16 dest, void *src,
                              int size)
{
        /* switch to SRAM Page 0 */
        wl3501_switch_page(this, (dest & 0x8000) ? WL3501_BSS_SPAGE1 :
                                                   WL3501_BSS_SPAGE0);
        /* set LMAL and LMAH */
        wl3501_outb(dest & 0xff, this->base_addr + WL3501_NIC_LMAL);
        wl3501_outb(((dest >> 8) & 0x7f), this->base_addr + WL3501_NIC_LMAH);

        /* rep out to Port A */
        wl3501_outsb(this->base_addr + WL3501_NIC_IODPA, src, size);
}

/**
 * wl3501_get_from_wla - Move 'size' bytes from card to PC
 * @src: Card addressing space
 * @dest: PC addressing space
 * @size: Bytes to move
 *
 * Move 'size' bytes from card to PC. (Shouldn't be interrupted)
 */
static void wl3501_get_from_wla(struct wl3501_card *this, u16 src, void *dest,
                                int size)
{
        /* switch to SRAM Page 0 */
        wl3501_switch_page(this, (src & 0x8000) ? WL3501_BSS_SPAGE1 :
                                                  WL3501_BSS_SPAGE0);
        /* set LMAL and LMAH */
        wl3501_outb(src & 0xff, this->base_addr + WL3501_NIC_LMAL);
        wl3501_outb((src >> 8) & 0x7f, this->base_addr + WL3501_NIC_LMAH);

        /* rep get from Port A */
        insb(this->base_addr + WL3501_NIC_IODPA, dest, size);
}

/*
 * Get/Allocate a free Tx Data Buffer
 *
 *  *--------------*-----------------*----------------------------------*
 *  |    PLCP      |    MAC Header   |  DST  SRC         Data ...       |
 *  |  (24 bytes)  |    (30 bytes)   |  (6)  (6)  (Ethernet Row Data)   |
 *  *--------------*-----------------*----------------------------------*
 *  \               \- IEEE 802.11 -/ \-------------- len --------------/
 *   \-struct wl3501_80211_tx_hdr--/   \-------- Ethernet Frame -------/
 *
 * Return = Postion in Card
 */
static u16 wl3501_get_tx_buffer(struct wl3501_card *this, u16 len)
{
        u16 next, blk_cnt = 0, zero = 0;
        u16 full_len = sizeof(struct wl3501_80211_tx_hdr) + len;
        u16 ret = 0;

        if (full_len > this->tx_buffer_cnt * 254)
                goto out;
        ret = this->tx_buffer_head;
        while (full_len) {
                if (full_len < 254)
                        full_len = 0;
                else
                        full_len -= 254;
                wl3501_get_from_wla(this, this->tx_buffer_head, &next,
                                    sizeof(next));
                if (!full_len)
                        wl3501_set_to_wla(this, this->tx_buffer_head, &zero,
                                          sizeof(zero));
                this->tx_buffer_head = next;
                blk_cnt++;
                /* if buffer is not enough */
                if (!next && full_len) {
                        this->tx_buffer_head = ret;
                        ret = 0;
                        goto out;
                }
        }
        this->tx_buffer_cnt -= blk_cnt;
out:
        return ret;
}

/*
 * Free an allocated Tx Buffer. ptr must be correct position.
 */
static void wl3501_free_tx_buffer(struct wl3501_card *this, u16 ptr)
{
        /* check if all space is not free */
        if (!this->tx_buffer_head)
                this->tx_buffer_head = ptr;
        else
                wl3501_set_to_wla(this, this->tx_buffer_tail,
                                  &ptr, sizeof(ptr));
        while (ptr) {
                u16 next;

                this->tx_buffer_cnt++;
                wl3501_get_from_wla(this, ptr, &next, sizeof(next));
                this->tx_buffer_tail = ptr;
                ptr = next;
        }
}

static int wl3501_esbq_req_test(struct wl3501_card *this)
{
        u8 tmp = 0;

        wl3501_get_from_wla(this, this->esbq_req_head + 3, &tmp, sizeof(tmp));
        return tmp & 0x80;
}

static void wl3501_esbq_req(struct wl3501_card *this, u16 *ptr)
{
        u16 tmp = 0;

        wl3501_set_to_wla(this, this->esbq_req_head, ptr, 2);
        wl3501_set_to_wla(this, this->esbq_req_head + 2, &tmp, sizeof(tmp));
        this->esbq_req_head += 4;
        if (this->esbq_req_head >= this->esbq_req_end)
                this->esbq_req_head = this->esbq_req_start;
}

static int wl3501_esbq_exec(struct wl3501_card *this, void *sig, int sig_size)
{
        int rc = -EIO;

        if (wl3501_esbq_req_test(this)) {
                u16 ptr = wl3501_get_tx_buffer(this, sig_size);
                if (ptr) {
                        wl3501_set_to_wla(this, ptr, sig, sig_size);
                        wl3501_esbq_req(this, &ptr);
                        rc = 0;
                }
        }
        return rc;
}

static int wl3501_get_mib_value(struct wl3501_card *this, u8 index,
                                void *bf, int size)
{
        struct wl3501_get_req sig = {
                .sig_id     = WL3501_SIG_GET_REQ,
                .mib_attrib = index,
        };
        unsigned long flags;
        int rc = -EIO;

        spin_lock_irqsave(&this->lock, flags);
        if (wl3501_esbq_req_test(this)) {
                u16 ptr = wl3501_get_tx_buffer(this, sizeof(sig));
                if (ptr) {
                        wl3501_set_to_wla(this, ptr, &sig, sizeof(sig));
                        wl3501_esbq_req(this, &ptr);
                        this->sig_get_confirm.mib_status = 255;
                        spin_unlock_irqrestore(&this->lock, flags);
                        rc = wait_event_interruptible(this->wait,
                                this->sig_get_confirm.mib_status != 255);
                        if (!rc)
                                memcpy(bf, this->sig_get_confirm.mib_value,
                                       size);
                        goto out;
                }
        }
        spin_unlock_irqrestore(&this->lock, flags);
out:
        return rc;
}

static int wl3501_pwr_mgmt(struct wl3501_card *this, int suspend)
{
        struct wl3501_pwr_mgmt_req sig = {
                .sig_id         = WL3501_SIG_PWR_MGMT_REQ,
                .pwr_save       = suspend,
                .wake_up        = !suspend,
                .receive_dtims  = 10,
        };
        unsigned long flags;
        int rc = -EIO;

        spin_lock_irqsave(&this->lock, flags);
        if (wl3501_esbq_req_test(this)) {
                u16 ptr = wl3501_get_tx_buffer(this, sizeof(sig));
                if (ptr) {
                        wl3501_set_to_wla(this, ptr, &sig, sizeof(sig));
                        wl3501_esbq_req(this, &ptr);
                        this->sig_pwr_mgmt_confirm.status = 255;
                        spin_unlock_irqrestore(&this->lock, flags);
                        rc = wait_event_interruptible(this->wait,
                                this->sig_pwr_mgmt_confirm.status != 255);
                        printk(KERN_INFO "%s: %s status=%d\n", __func__,
                               suspend ? "suspend" : "resume",
                               this->sig_pwr_mgmt_confirm.status);
                        goto out;
                }
        }
        spin_unlock_irqrestore(&this->lock, flags);
out:
        return rc;
}

/**
 * wl3501_send_pkt - Send a packet.
 * @this - card
 *
 * Send a packet.
 *
 * data = Ethernet raw frame.  (e.g. data[0] - data[5] is Dest MAC Addr,
 *                                   data[6] - data[11] is Src MAC Addr)
 * Ref: IEEE 802.11
 */
static int wl3501_send_pkt(struct wl3501_card *this, u8 *data, u16 len)
{
        u16 bf, sig_bf, next, tmplen, pktlen;
        struct wl3501_md_req sig = {
                .sig_id = WL3501_SIG_MD_REQ,
        };
        u8 *pdata = (char *)data;
        int rc = -EIO;

        if (wl3501_esbq_req_test(this)) {
                sig_bf = wl3501_get_tx_buffer(this, sizeof(sig));
                rc = -ENOMEM;
                if (!sig_bf)    /* No free buffer available */
                        goto out;
                bf = wl3501_get_tx_buffer(this, len + 26 + 24);
                if (!bf) {
                        /* No free buffer available */
                        wl3501_free_tx_buffer(this, sig_bf);
                        goto out;
                }
                rc = 0;
                memcpy(&sig.daddr[0], pdata, 12);
                pktlen = len - 12;
                pdata += 12;
                sig.data = bf;
                if (((*pdata) * 256 + (*(pdata + 1))) > 1500) {
                        u8 addr4[ETH_ALEN] = {
                                [0] = 0xAA, [1] = 0xAA, [2] = 0x03, [4] = 0x00,
                        };

                        wl3501_set_to_wla(this, bf + 2 +
                                          offsetof(struct wl3501_tx_hdr, addr4),
                                          addr4, sizeof(addr4));
                        sig.size = pktlen + 24 + 4 + 6;
                        if (pktlen > (254 - sizeof(struct wl3501_tx_hdr))) {
                                tmplen = 254 - sizeof(struct wl3501_tx_hdr);
                                pktlen -= tmplen;
                        } else {
                                tmplen = pktlen;
                                pktlen = 0;
                        }
                        wl3501_set_to_wla(this,
                                          bf + 2 + sizeof(struct wl3501_tx_hdr),
                                          pdata, tmplen);
                        pdata += tmplen;
                        wl3501_get_from_wla(this, bf, &next, sizeof(next));
                        bf = next;
                } else {
                        sig.size = pktlen + 24 + 4 - 2;
                        pdata += 2;
                        pktlen -= 2;
                        if (pktlen > (254 - sizeof(struct wl3501_tx_hdr) + 6)) {
                                tmplen = 254 - sizeof(struct wl3501_tx_hdr) + 6;
                                pktlen -= tmplen;
                        } else {
                                tmplen = pktlen;
                                pktlen = 0;
                        }
                        wl3501_set_to_wla(this, bf + 2 +
                                          offsetof(struct wl3501_tx_hdr, addr4),
                                          pdata, tmplen);
                        pdata += tmplen;
                        wl3501_get_from_wla(this, bf, &next, sizeof(next));
                        bf = next;
                }
                while (pktlen > 0) {
                        if (pktlen > 254) {
                                tmplen = 254;
                                pktlen -= 254;
                        } else {
                                tmplen = pktlen;
                                pktlen = 0;
                        }
                        wl3501_set_to_wla(this, bf + 2, pdata, tmplen);
                        pdata += tmplen;
                        wl3501_get_from_wla(this, bf, &next, sizeof(next));
                        bf = next;
                }
                wl3501_set_to_wla(this, sig_bf, &sig, sizeof(sig));
                wl3501_esbq_req(this, &sig_bf);
        }
out:
        return rc;
}

static int wl3501_mgmt_resync(struct wl3501_card *this)
{
        struct wl3501_resync_req sig = {
                .sig_id = WL3501_SIG_RESYNC_REQ,
        };

        return wl3501_esbq_exec(this, &sig, sizeof(sig));
}

static inline int wl3501_fw_bss_type(struct wl3501_card *this)
{
        return this->net_type == IW_MODE_INFRA ? WL3501_NET_TYPE_INFRA :
                                                 WL3501_NET_TYPE_ADHOC;
}

static inline int wl3501_fw_cap_info(struct wl3501_card *this)
{
        return this->net_type == IW_MODE_INFRA ? WL3501_MGMT_CAPABILITY_ESS :
                                                 WL3501_MGMT_CAPABILITY_IBSS;
}

static int wl3501_mgmt_scan(struct wl3501_card *this, u16 chan_time)
{
        struct wl3501_scan_req sig = {
                .sig_id         = WL3501_SIG_SCAN_REQ,
                .scan_type      = WL3501_SCAN_TYPE_ACTIVE,
                .probe_delay    = 0x10,
                .min_chan_time  = chan_time,
                .max_chan_time  = chan_time,
                .bss_type       = wl3501_fw_bss_type(this),
        };

        this->bss_cnt = this->join_sta_bss = 0;
        return wl3501_esbq_exec(this, &sig, sizeof(sig));
}

static int wl3501_mgmt_join(struct wl3501_card *this, u16 stas)
{
        struct wl3501_join_req sig = {
                .sig_id           = WL3501_SIG_JOIN_REQ,
                .timeout          = 10,
                .ds_pset = {
                        .el = {
                                .id  = IW_MGMT_INFO_ELEMENT_DS_PARAMETER_SET,
                                .len = 1,
                        },
                        .chan   = this->chan,
                },
        };

        memcpy(&sig.beacon_period, &this->bss_set[stas].beacon_period, 72);
        return wl3501_esbq_exec(this, &sig, sizeof(sig));
}

static int wl3501_mgmt_start(struct wl3501_card *this)
{
        struct wl3501_start_req sig = {
                .sig_id                 = WL3501_SIG_START_REQ,
                .beacon_period          = 400,
                .dtim_period            = 1,
                .ds_pset = {
                        .el = {
                                .id  = IW_MGMT_INFO_ELEMENT_DS_PARAMETER_SET,
                                .len = 1,
                        },
                        .chan   = this->chan,
                },
                .bss_basic_rset = {
                        .el = {
                                .id     = IW_MGMT_INFO_ELEMENT_SUPPORTED_RATES,
                                .len = 2,
                        },
                        .data_rate_labels = {
                                [0] = IW_MGMT_RATE_LABEL_MANDATORY |
                                      IW_MGMT_RATE_LABEL_1MBIT,
                                [1] = IW_MGMT_RATE_LABEL_MANDATORY |
                                      IW_MGMT_RATE_LABEL_2MBIT,
                        },
                },
                .operational_rset       = {
                        .el = {
                                .id     = IW_MGMT_INFO_ELEMENT_SUPPORTED_RATES,
                                .len = 2,
                        },
                        .data_rate_labels = {
                                [0] = IW_MGMT_RATE_LABEL_MANDATORY |
                                      IW_MGMT_RATE_LABEL_1MBIT,
                                [1] = IW_MGMT_RATE_LABEL_MANDATORY |
                                      IW_MGMT_RATE_LABEL_2MBIT,
                        },
                },
                .ibss_pset              = {
                        .el = {
                                .id      = IW_MGMT_INFO_ELEMENT_IBSS_PARAMETER_SET,
                                .len     = 2,
                        },
                        .atim_window = 10,
                },
                .bss_type               = wl3501_fw_bss_type(this),
                .cap_info               = wl3501_fw_cap_info(this),
        };

        iw_copy_mgmt_info_element(&sig.ssid.el, &this->essid.el);
        iw_copy_mgmt_info_element(&this->keep_essid.el, &this->essid.el);
        return wl3501_esbq_exec(this, &sig, sizeof(sig));
}

static void wl3501_mgmt_scan_confirm(struct wl3501_card *this, u16 addr)
{
        u16 i = 0;
        int matchflag = 0;
        struct wl3501_scan_confirm sig;

        pr_debug("entry");
        wl3501_get_from_wla(this, addr, &sig, sizeof(sig));
        if (sig.status == WL3501_STATUS_SUCCESS) {
                pr_debug("success");
                if ((this->net_type == IW_MODE_INFRA &&
                     (sig.cap_info & WL3501_MGMT_CAPABILITY_ESS)) ||
                    (this->net_type == IW_MODE_ADHOC &&
                     (sig.cap_info & WL3501_MGMT_CAPABILITY_IBSS)) ||
                    this->net_type == IW_MODE_AUTO) {
                        if (!this->essid.el.len)
                                matchflag = 1;
                        else if (this->essid.el.len == 3 &&
                                 !memcmp(this->essid.essid, "ANY", 3))
                                matchflag = 1;
                        else if (this->essid.el.len != sig.ssid.el.len)
                                matchflag = 0;
                        else if (memcmp(this->essid.essid, sig.ssid.essid,
                                        this->essid.el.len))
                                matchflag = 0;
                        else
                                matchflag = 1;
                        if (matchflag) {
                                for (i = 0; i < this->bss_cnt; i++) {
                                        if (!memcmp(this->bss_set[i].bssid,
                                                    sig.bssid, ETH_ALEN)) {
                                                matchflag = 0;
                                                break;
                                        }
                                }
                        }
                        if (matchflag && (i < 20)) {
                                memcpy(&this->bss_set[i].beacon_period,
                                       &sig.beacon_period, 73);
                                this->bss_cnt++;
                                this->rssi = sig.rssi;
                        }
                }
        } else if (sig.status == WL3501_STATUS_TIMEOUT) {
                pr_debug("timeout");
                this->join_sta_bss = 0;
                for (i = this->join_sta_bss; i < this->bss_cnt; i++)
                        if (!wl3501_mgmt_join(this, i))
                                break;
                this->join_sta_bss = i;
                if (this->join_sta_bss == this->bss_cnt) {
                        if (this->net_type == IW_MODE_INFRA)
                                wl3501_mgmt_scan(this, 100);
                        else {
                                this->adhoc_times++;
                                if (this->adhoc_times > WL3501_MAX_ADHOC_TRIES)
                                        wl3501_mgmt_start(this);
                                else
                                        wl3501_mgmt_scan(this, 100);
                        }
                }
        }
}

/**
 * wl3501_block_interrupt - Mask interrupt from SUTRO
 * @this - card
 *
 * Mask interrupt from SUTRO. (i.e. SUTRO cannot interrupt the HOST)
 * Return: 1 if interrupt is originally enabled
 */
static int wl3501_block_interrupt(struct wl3501_card *this)
{
        u8 old = inb(this->base_addr + WL3501_NIC_GCR);
        u8 new = old & (~(WL3501_GCR_ECINT | WL3501_GCR_INT2EC |
                        WL3501_GCR_ENECINT));

        wl3501_outb(new, this->base_addr + WL3501_NIC_GCR);
        return old & WL3501_GCR_ENECINT;
}

/**
 * wl3501_unblock_interrupt - Enable interrupt from SUTRO
 * @this - card
 *
 * Enable interrupt from SUTRO. (i.e. SUTRO can interrupt the HOST)
 * Return: 1 if interrupt is originally enabled
 */
static int wl3501_unblock_interrupt(struct wl3501_card *this)
{
        u8 old = inb(this->base_addr + WL3501_NIC_GCR);
        u8 new = (old & ~(WL3501_GCR_ECINT | WL3501_GCR_INT2EC)) |
                  WL3501_GCR_ENECINT;

        wl3501_outb(new, this->base_addr + WL3501_NIC_GCR);
        return old & WL3501_GCR_ENECINT;
}

/**
 * wl3501_receive - Receive data from Receive Queue.
 *
 * Receive data from Receive Queue.
 *
 * @this: card
 * @bf: address of host
 * @size: size of buffer.
 */
static u16 wl3501_receive(struct wl3501_card *this, u8 *bf, u16 size)
{
        u16 next_addr, next_addr1;
        u8 *data = bf + 12;

        size -= 12;
        wl3501_get_from_wla(this, this->start_seg + 2,
                            &next_addr, sizeof(next_addr));
        if (size > WL3501_BLKSZ - sizeof(struct wl3501_rx_hdr)) {
                wl3501_get_from_wla(this,
                                    this->start_seg +
                                        sizeof(struct wl3501_rx_hdr), data,
                                    WL3501_BLKSZ -
                                        sizeof(struct wl3501_rx_hdr));
                size -= WL3501_BLKSZ - sizeof(struct wl3501_rx_hdr);
                data += WL3501_BLKSZ - sizeof(struct wl3501_rx_hdr);
        } else {
                wl3501_get_from_wla(this,
                                    this->start_seg +
                                        sizeof(struct wl3501_rx_hdr),
                                    data, size);
                size = 0;
        }
        while (size > 0) {
                if (size > WL3501_BLKSZ - 5) {
                        wl3501_get_from_wla(this, next_addr + 5, data,
                                            WL3501_BLKSZ - 5);
                        size -= WL3501_BLKSZ - 5;
                        data += WL3501_BLKSZ - 5;
                        wl3501_get_from_wla(this, next_addr + 2, &next_addr1,
                                            sizeof(next_addr1));
                        next_addr = next_addr1;
                } else {
                        wl3501_get_from_wla(this, next_addr + 5, data, size);
                        size = 0;
                }
        }
        return 0;
}

static void wl3501_esbq_req_free(struct wl3501_card *this)
{
        u8 tmp;
        u16 addr;

        if (this->esbq_req_head == this->esbq_req_tail)
                goto out;
        wl3501_get_from_wla(this, this->esbq_req_tail + 3, &tmp, sizeof(tmp));
        if (!(tmp & 0x80))
                goto out;
        wl3501_get_from_wla(this, this->esbq_req_tail, &addr, sizeof(addr));
        wl3501_free_tx_buffer(this, addr);
        this->esbq_req_tail += 4;
        if (this->esbq_req_tail >= this->esbq_req_end)
                this->esbq_req_tail = this->esbq_req_start;
out:
        return;
}

static int wl3501_esbq_confirm(struct wl3501_card *this)
{
        u8 tmp;

        wl3501_get_from_wla(this, this->esbq_confirm + 3, &tmp, sizeof(tmp));
        return tmp & 0x80;
}

static void wl3501_online(struct net_device *dev)
{
        struct wl3501_card *this = netdev_priv(dev);

        printk(KERN_INFO "%s: Wireless LAN online. BSSID: %pM\n",
               dev->name, this->bssid);
        netif_wake_queue(dev);
}

static void wl3501_esbq_confirm_done(struct wl3501_card *this)
{
        u8 tmp = 0;

        wl3501_set_to_wla(this, this->esbq_confirm + 3, &tmp, sizeof(tmp));
        this->esbq_confirm += 4;
        if (this->esbq_confirm >= this->esbq_confirm_end)
                this->esbq_confirm = this->esbq_confirm_start;
}

static int wl3501_mgmt_auth(struct wl3501_card *this)
{
        struct wl3501_auth_req sig = {
                .sig_id  = WL3501_SIG_AUTH_REQ,
                .type    = WL3501_SYS_TYPE_OPEN,
                .timeout = 1000,
        };

        pr_debug("entry");
        memcpy(sig.mac_addr, this->bssid, ETH_ALEN);
        return wl3501_esbq_exec(this, &sig, sizeof(sig));
}

static int wl3501_mgmt_association(struct wl3501_card *this)
{
        struct wl3501_assoc_req sig = {
                .sig_id          = WL3501_SIG_ASSOC_REQ,
                .timeout         = 1000,
                .listen_interval = 5,
                .cap_info        = this->cap_info,
        };

        pr_debug("entry");
        memcpy(sig.mac_addr, this->bssid, ETH_ALEN);
        return wl3501_esbq_exec(this, &sig, sizeof(sig));
}

static void wl3501_mgmt_join_confirm(struct net_device *dev, u16 addr)
{
        struct wl3501_card *this = netdev_priv(dev);
        struct wl3501_join_confirm sig;

        pr_debug("entry");
        wl3501_get_from_wla(this, addr, &sig, sizeof(sig));
        if (sig.status == WL3501_STATUS_SUCCESS) {
                if (this->net_type == IW_MODE_INFRA) {
                        if (this->join_sta_bss < this->bss_cnt) {
                                const int i = this->join_sta_bss;
                                memcpy(this->bssid,
                                       this->bss_set[i].bssid, ETH_ALEN);
                                this->chan = this->bss_set[i].ds_pset.chan;
                                iw_copy_mgmt_info_element(&this->keep_essid.el,
                                                     &this->bss_set[i].ssid.el);
                                wl3501_mgmt_auth(this);
                        }
                } else {
                        const int i = this->join_sta_bss;

                        memcpy(&this->bssid, &this->bss_set[i].bssid, ETH_ALEN);
                        this->chan = this->bss_set[i].ds_pset.chan;
                        iw_copy_mgmt_info_element(&this->keep_essid.el,
                                                  &this->bss_set[i].ssid.el);
                        wl3501_online(dev);
                }
        } else {
                int i;
                this->join_sta_bss++;
                for (i = this->join_sta_bss; i < this->bss_cnt; i++)
                        if (!wl3501_mgmt_join(this, i))
                                break;
                this->join_sta_bss = i;
                if (this->join_sta_bss == this->bss_cnt) {
                        if (this->net_type == IW_MODE_INFRA)
                                wl3501_mgmt_scan(this, 100);
                        else {
                                this->adhoc_times++;
                                if (this->adhoc_times > WL3501_MAX_ADHOC_TRIES)
                                        wl3501_mgmt_start(this);
                                else
                                        wl3501_mgmt_scan(this, 100);
                        }
                }
        }
}

static inline void wl3501_alarm_interrupt(struct net_device *dev,
                                          struct wl3501_card *this)
{
        if (this->net_type == IW_MODE_INFRA) {
                printk(KERN_INFO "Wireless LAN offline\n");
                netif_stop_queue(dev);
                wl3501_mgmt_resync(this);
        }
}

static inline void wl3501_md_confirm_interrupt(struct net_device *dev,
                                               struct wl3501_card *this,
                                               u16 addr)
{
        struct wl3501_md_confirm sig;

        pr_debug("entry");
        wl3501_get_from_wla(this, addr, &sig, sizeof(sig));
        wl3501_free_tx_buffer(this, sig.data);
        if (netif_queue_stopped(dev))
                netif_wake_queue(dev);
}

static inline void wl3501_md_ind_interrupt(struct net_device *dev,
                                           struct wl3501_card *this, u16 addr)
{
        struct wl3501_md_ind sig;
        struct sk_buff *skb;
        u8 rssi, addr4[ETH_ALEN];
        u16 pkt_len;

        wl3501_get_from_wla(this, addr, &sig, sizeof(sig));
        this->start_seg = sig.data;
        wl3501_get_from_wla(this,
                            sig.data + offsetof(struct wl3501_rx_hdr, rssi),
                            &rssi, sizeof(rssi));
        this->rssi = rssi <= 63 ? (rssi * 100) / 64 : 255;

        wl3501_get_from_wla(this,
                            sig.data +
                                offsetof(struct wl3501_rx_hdr, addr4),
                            &addr4, sizeof(addr4));
        if (!(addr4[0] == 0xAA && addr4[1] == 0xAA &&
              addr4[2] == 0x03 && addr4[4] == 0x00)) {
                printk(KERN_INFO "Insupported packet type!\n");
                return;
        }
        pkt_len = sig.size + 12 - 24 - 4 - 6;

        skb = dev_alloc_skb(pkt_len + 5);

        if (!skb) {
                printk(KERN_WARNING "%s: Can't alloc a sk_buff of size %d.\n",
                       dev->name, pkt_len);
                dev->stats.rx_dropped++;
        } else {
                skb->dev = dev;
                skb_reserve(skb, 2); /* IP headers on 16 bytes boundaries */
                skb_copy_to_linear_data(skb, (unsigned char *)&sig.daddr, 12);
                wl3501_receive(this, skb->data, pkt_len);
                skb_put(skb, pkt_len);
                skb->protocol   = eth_type_trans(skb, dev);
                dev->stats.rx_packets++;
                dev->stats.rx_bytes += skb->len;
                netif_rx(skb);
        }
}

static inline void wl3501_get_confirm_interrupt(struct wl3501_card *this,
                                                u16 addr, void *sig, int size)
{
        pr_debug("entry");
        wl3501_get_from_wla(this, addr, &this->sig_get_confirm,
                            sizeof(this->sig_get_confirm));
        wake_up(&this->wait);
}

static inline void wl3501_start_confirm_interrupt(struct net_device *dev,
                                                  struct wl3501_card *this,
                                                  u16 addr)
{
        struct wl3501_start_confirm sig;

        pr_debug("entry");
        wl3501_get_from_wla(this, addr, &sig, sizeof(sig));

        if (sig.status == WL3501_STATUS_SUCCESS)
                netif_wake_queue(dev);
}

static inline void wl3501_assoc_confirm_interrupt(struct net_device *dev,
                                                  u16 addr)
{
        struct wl3501_card *this = netdev_priv(dev);
        struct wl3501_assoc_confirm sig;

        pr_debug("entry");
        wl3501_get_from_wla(this, addr, &sig, sizeof(sig));

        if (sig.status == WL3501_STATUS_SUCCESS)
                wl3501_online(dev);
}

static inline void wl3501_auth_confirm_interrupt(struct wl3501_card *this,
                                                 u16 addr)
{
        struct wl3501_auth_confirm sig;

        pr_debug("entry");
        wl3501_get_from_wla(this, addr, &sig, sizeof(sig));

        if (sig.status == WL3501_STATUS_SUCCESS)
                wl3501_mgmt_association(this);
        else
                wl3501_mgmt_resync(this);
}

static inline void wl3501_rx_interrupt(struct net_device *dev)
{
        int morepkts;
        u16 addr;
        u8 sig_id;
        struct wl3501_card *this = netdev_priv(dev);

        pr_debug("entry");
loop:
        morepkts = 0;
        if (!wl3501_esbq_confirm(this))
                goto free;
        wl3501_get_from_wla(this, this->esbq_confirm, &addr, sizeof(addr));
        wl3501_get_from_wla(this, addr + 2, &sig_id, sizeof(sig_id));

        switch (sig_id) {
        case WL3501_SIG_DEAUTH_IND:
        case WL3501_SIG_DISASSOC_IND:
        case WL3501_SIG_ALARM:
                wl3501_alarm_interrupt(dev, this);
                break;
        case WL3501_SIG_MD_CONFIRM:
                wl3501_md_confirm_interrupt(dev, this, addr);
                break;
        case WL3501_SIG_MD_IND:
                wl3501_md_ind_interrupt(dev, this, addr);
                break;
        case WL3501_SIG_GET_CONFIRM:
                wl3501_get_confirm_interrupt(this, addr,
                                             &this->sig_get_confirm,
                                             sizeof(this->sig_get_confirm));
                break;
        case WL3501_SIG_PWR_MGMT_CONFIRM:
                wl3501_get_confirm_interrupt(this, addr,
                                             &this->sig_pwr_mgmt_confirm,
                                            sizeof(this->sig_pwr_mgmt_confirm));
                break;
        case WL3501_SIG_START_CONFIRM:
                wl3501_start_confirm_interrupt(dev, this, addr);
                break;
        case WL3501_SIG_SCAN_CONFIRM:
                wl3501_mgmt_scan_confirm(this, addr);
                break;
        case WL3501_SIG_JOIN_CONFIRM:
                wl3501_mgmt_join_confirm(dev, addr);
                break;
        case WL3501_SIG_ASSOC_CONFIRM:
                wl3501_assoc_confirm_interrupt(dev, addr);
                break;
        case WL3501_SIG_AUTH_CONFIRM:
                wl3501_auth_confirm_interrupt(this, addr);
                break;
        case WL3501_SIG_RESYNC_CONFIRM:
                wl3501_mgmt_resync(this); /* FIXME: should be resync_confirm */
                break;
        }
        wl3501_esbq_confirm_done(this);
        morepkts = 1;
        /* free request if necessary */
free:
        wl3501_esbq_req_free(this);
        if (morepkts)
                goto loop;
}

static inline void wl3501_ack_interrupt(struct wl3501_card *this)
{
        wl3501_outb(WL3501_GCR_ECINT, this->base_addr + WL3501_NIC_GCR);
}

/**
 * wl3501_interrupt - Hardware interrupt from card.
 * @irq - Interrupt number
 * @dev_id - net_device
 *
 * We must acknowledge the interrupt as soon as possible, and block the
 * interrupt from the same card immediately to prevent re-entry.
 *
 * Before accessing the Control_Status_Block, we must lock SUTRO first.
 * On the other hand, to prevent SUTRO from malfunctioning, we must
 * unlock the SUTRO as soon as possible.
 */
static irqreturn_t wl3501_interrupt(int irq, void *dev_id)
{
        struct net_device *dev = dev_id;
        struct wl3501_card *this;

        this = netdev_priv(dev);
        spin_lock(&this->lock);
        wl3501_ack_interrupt(this);
        wl3501_block_interrupt(this);
        wl3501_rx_interrupt(dev);
        wl3501_unblock_interrupt(this);
        spin_unlock(&this->lock);

        return IRQ_HANDLED;
}

static int wl3501_reset_board(struct wl3501_card *this)
{
        u8 tmp = 0;
        int i, rc = 0;

        /* Coreset */
        wl3501_outb_p(WL3501_GCR_CORESET, this->base_addr + WL3501_NIC_GCR);
        wl3501_outb_p(0, this->base_addr + WL3501_NIC_GCR);
        wl3501_outb_p(WL3501_GCR_CORESET, this->base_addr + WL3501_NIC_GCR);

        /* Reset SRAM 0x480 to zero */
        wl3501_set_to_wla(this, 0x480, &tmp, sizeof(tmp));

        /* Start up */
        wl3501_outb_p(0, this->base_addr + WL3501_NIC_GCR);

        WL3501_NOPLOOP(1024 * 50);

        wl3501_unblock_interrupt(this); /* acme: was commented */

        /* Polling Self_Test_Status */
        for (i = 0; i < 10000; i++) {
                wl3501_get_from_wla(this, 0x480, &tmp, sizeof(tmp));

                if (tmp == 'W') {
                        /* firmware complete all test successfully */
                        tmp = 'A';
                        wl3501_set_to_wla(this, 0x480, &tmp, sizeof(tmp));
                        goto out;
                }
                WL3501_NOPLOOP(10);
        }
        printk(KERN_WARNING "%s: failed to reset the board!\n", __func__);
        rc = -ENODEV;
out:
        return rc;
}

static int wl3501_init_firmware(struct wl3501_card *this)
{
        u16 ptr, next;
        int rc = wl3501_reset_board(this);

        if (rc)
                goto fail;
        this->card_name[0] = '\0';
        wl3501_get_from_wla(this, 0x1a00,
                            this->card_name, sizeof(this->card_name));
        this->card_name[sizeof(this->card_name) - 1] = '\0';
        this->firmware_date[0] = '\0';
        wl3501_get_from_wla(this, 0x1a40,
                            this->firmware_date, sizeof(this->firmware_date));
        this->firmware_date[sizeof(this->firmware_date) - 1] = '\0';
        /* Switch to SRAM Page 0 */
        wl3501_switch_page(this, WL3501_BSS_SPAGE0);
        /* Read parameter from card */
        wl3501_get_from_wla(this, 0x482, &this->esbq_req_start, 2);
        wl3501_get_from_wla(this, 0x486, &this->esbq_req_end, 2);
        wl3501_get_from_wla(this, 0x488, &this->esbq_confirm_start, 2);
        wl3501_get_from_wla(this, 0x48c, &this->esbq_confirm_end, 2);
        wl3501_get_from_wla(this, 0x48e, &this->tx_buffer_head, 2);
        wl3501_get_from_wla(this, 0x492, &this->tx_buffer_size, 2);
        this->esbq_req_tail     = this->esbq_req_head = this->esbq_req_start;
        this->esbq_req_end     += this->esbq_req_start;
        this->esbq_confirm      = this->esbq_confirm_start;
        this->esbq_confirm_end += this->esbq_confirm_start;
        /* Initial Tx Buffer */
        this->tx_buffer_cnt = 1;
        ptr = this->tx_buffer_head;
        next = ptr + WL3501_BLKSZ;
        while ((next - this->tx_buffer_head) < this->tx_buffer_size) {
                this->tx_buffer_cnt++;
                wl3501_set_to_wla(this, ptr, &next, sizeof(next));
                ptr = next;
                next = ptr + WL3501_BLKSZ;
        }
        rc = 0;
        next = 0;
        wl3501_set_to_wla(this, ptr, &next, sizeof(next));
        this->tx_buffer_tail = ptr;
out:
        return rc;
fail:
        printk(KERN_WARNING "%s: failed!\n", __func__);
        goto out;
}

static int wl3501_close(struct net_device *dev)
{
        struct wl3501_card *this = netdev_priv(dev);
        int rc = -ENODEV;
        unsigned long flags;
        struct pcmcia_device *link;
        link = this->p_dev;

        spin_lock_irqsave(&this->lock, flags);
        link->open--;

        /* Stop wl3501_hard_start_xmit() from now on */
        netif_stop_queue(dev);
        wl3501_ack_interrupt(this);

        /* Mask interrupts from the SUTRO */
        wl3501_block_interrupt(this);

        rc = 0;
        printk(KERN_INFO "%s: WL3501 closed\n", dev->name);
        spin_unlock_irqrestore(&this->lock, flags);
        return rc;
}

/**
 * wl3501_reset - Reset the SUTRO.
 * @dev - network device
 *
 * It is almost the same as wl3501_open(). In fact, we may just wl3501_close()
 * and wl3501_open() again, but I wouldn't like to free_irq() when the driver
 * is running. It seems to be dangerous.
 */
static int wl3501_reset(struct net_device *dev)
{
        struct wl3501_card *this = netdev_priv(dev);
        int rc = -ENODEV;

        wl3501_block_interrupt(this);

        if (wl3501_init_firmware(this)) {
                printk(KERN_WARNING "%s: Can't initialize Firmware!\n",
                       dev->name);
                /* Free IRQ, and mark IRQ as unused */
                free_irq(dev->irq, dev);
                goto out;
        }

        /*
         * Queue has to be started only when the Card is Started
         */
        netif_stop_queue(dev);
        this->adhoc_times = 0;
        wl3501_ack_interrupt(this);
        wl3501_unblock_interrupt(this);
        wl3501_mgmt_scan(this, 100);
        pr_debug("%s: device reset", dev->name);
        rc = 0;
out:
        return rc;
}

static void wl3501_tx_timeout(struct net_device *dev)
{
        struct wl3501_card *this = netdev_priv(dev);
        struct net_device_stats *stats = &dev->stats;
        unsigned long flags;
        int rc;

        stats->tx_errors++;
        spin_lock_irqsave(&this->lock, flags);
        rc = wl3501_reset(dev);
        spin_unlock_irqrestore(&this->lock, flags);
        if (rc)
                printk(KERN_ERR "%s: Error %d resetting card on Tx timeout!\n",
                       dev->name, rc);
        else {
                dev->trans_start = jiffies; /* prevent tx timeout */
                netif_wake_queue(dev);
        }
}

/*
 * Return : 0 - OK
 *          1 - Could not transmit (dev_queue_xmit will queue it)
 *              and try to sent it later
 */
static netdev_tx_t wl3501_hard_start_xmit(struct sk_buff *skb,
                                                struct net_device *dev)
{
        int enabled, rc;
        struct wl3501_card *this = netdev_priv(dev);
        unsigned long flags;

        spin_lock_irqsave(&this->lock, flags);
        enabled = wl3501_block_interrupt(this);
        rc = wl3501_send_pkt(this, skb->data, skb->len);
        if (enabled)
                wl3501_unblock_interrupt(this);
        if (rc) {
                ++dev->stats.tx_dropped;
                netif_stop_queue(dev);
        } else {
                ++dev->stats.tx_packets;
                dev->stats.tx_bytes += skb->len;
                kfree_skb(skb);

                if (this->tx_buffer_cnt < 2)
                        netif_stop_queue(dev);
        }
        spin_unlock_irqrestore(&this->lock, flags);
        return NETDEV_TX_OK;
}

static int wl3501_open(struct net_device *dev)
{
        int rc = -ENODEV;
        struct wl3501_card *this = netdev_priv(dev);
        unsigned long flags;
        struct pcmcia_device *link;
        link = this->p_dev;

        spin_lock_irqsave(&this->lock, flags);
        if (!pcmcia_dev_present(link))
                goto out;
        netif_device_attach(dev);
        link->open++;

        /* Initial WL3501 firmware */
        pr_debug("%s: Initialize WL3501 firmware...", dev->name);
        if (wl3501_init_firmware(this))
                goto fail;
        /* Initial device variables */
        this->adhoc_times = 0;
        /* Acknowledge Interrupt, for cleaning last state */
        wl3501_ack_interrupt(this);

        /* Enable interrupt from card after all */
        wl3501_unblock_interrupt(this);
        wl3501_mgmt_scan(this, 100);
        rc = 0;
        pr_debug("%s: WL3501 opened", dev->name);
        printk(KERN_INFO "%s: Card Name: %s\n"
                         "%s: Firmware Date: %s\n",
                         dev->name, this->card_name,
                         dev->name, this->firmware_date);
out:
        spin_unlock_irqrestore(&this->lock, flags);
        return rc;
fail:
        printk(KERN_WARNING "%s: Can't initialize firmware!\n", dev->name);
        goto out;
}

static struct iw_statistics *wl3501_get_wireless_stats(struct net_device *dev)
{
        struct wl3501_card *this = netdev_priv(dev);
        struct iw_statistics *wstats = &this->wstats;
        u32 value; /* size checked: it is u32 */

        memset(wstats, 0, sizeof(*wstats));
        wstats->status = netif_running(dev);
        if (!wl3501_get_mib_value(this, WL3501_MIB_ATTR_WEP_ICV_ERROR_COUNT,
                                  &value, sizeof(value)))
                wstats->discard.code += value;
        if (!wl3501_get_mib_value(this, WL3501_MIB_ATTR_WEP_UNDECRYPTABLE_COUNT,
                                  &value, sizeof(value)))
                wstats->discard.code += value;
        if (!wl3501_get_mib_value(this, WL3501_MIB_ATTR_WEP_EXCLUDED_COUNT,
                                  &value, sizeof(value)))
                wstats->discard.code += value;
        if (!wl3501_get_mib_value(this, WL3501_MIB_ATTR_RETRY_COUNT,
                                  &value, sizeof(value)))
                wstats->discard.retries = value;
        if (!wl3501_get_mib_value(this, WL3501_MIB_ATTR_FAILED_COUNT,
                                  &value, sizeof(value)))
                wstats->discard.misc += value;
        if (!wl3501_get_mib_value(this, WL3501_MIB_ATTR_RTS_FAILURE_COUNT,
                                  &value, sizeof(value)))
                wstats->discard.misc += value;
        if (!wl3501_get_mib_value(this, WL3501_MIB_ATTR_ACK_FAILURE_COUNT,
                                  &value, sizeof(value)))
                wstats->discard.misc += value;
        if (!wl3501_get_mib_value(this, WL3501_MIB_ATTR_FRAME_DUPLICATE_COUNT,
                                  &value, sizeof(value)))
                wstats->discard.misc += value;
        return wstats;
}

/**
 * wl3501_detach - deletes a driver "instance"
 * @link - FILL_IN
 *
 * This deletes a driver "instance". The device is de-registered with Card
 * Services. If it has been released, all local data structures are freed.
 * Otherwise, the structures will be freed when the device is released.
 */
static void wl3501_detach(struct pcmcia_device *link)
{
        struct net_device *dev = link->priv;

        /* If the device is currently configured and active, we won't actually
         * delete it yet.  Instead, it is marked so that when the release()
         * function is called, that will trigger a proper detach(). */

        while (link->open > 0)
                wl3501_close(dev);

        netif_device_detach(dev);
        wl3501_release(link);

        unregister_netdev(dev);

        if (link->priv)
                free_netdev(link->priv);
}

static int wl3501_get_name(struct net_device *dev, struct iw_request_info *info,
                           union iwreq_data *wrqu, char *extra)
{
        strlcpy(wrqu->name, "IEEE 802.11-DS", sizeof(wrqu->name));
        return 0;
}

static int wl3501_set_freq(struct net_device *dev, struct iw_request_info *info,
                           union iwreq_data *wrqu, char *extra)
{
        struct wl3501_card *this = netdev_priv(dev);
        int channel = wrqu->freq.m;
        int rc = -EINVAL;

        if (iw_valid_channel(this->reg_domain, channel)) {
                this->chan = channel;
                rc = wl3501_reset(dev);
        }
        return rc;
}

static int wl3501_get_freq(struct net_device *dev, struct iw_request_info *info,
                           union iwreq_data *wrqu, char *extra)
{
        struct wl3501_card *this = netdev_priv(dev);

        wrqu->freq.m = ieee80211_dsss_chan_to_freq(this->chan) * 100000;
        wrqu->freq.e = 1;
        return 0;
}

static int wl3501_set_mode(struct net_device *dev, struct iw_request_info *info,
                           union iwreq_data *wrqu, char *extra)
{
        int rc = -EINVAL;

        if (wrqu->mode == IW_MODE_INFRA ||
            wrqu->mode == IW_MODE_ADHOC ||
            wrqu->mode == IW_MODE_AUTO) {
                struct wl3501_card *this = netdev_priv(dev);

                this->net_type = wrqu->mode;
                rc = wl3501_reset(dev);
        }
        return rc;
}

static int wl3501_get_mode(struct net_device *dev, struct iw_request_info *info,
                           union iwreq_data *wrqu, char *extra)
{
        struct wl3501_card *this = netdev_priv(dev);

        wrqu->mode = this->net_type;
        return 0;
}

static int wl3501_get_sens(struct net_device *dev, struct iw_request_info *info,
                           union iwreq_data *wrqu, char *extra)
{
        struct wl3501_card *this = netdev_priv(dev);

        wrqu->sens.value = this->rssi;
        wrqu->sens.disabled = !wrqu->sens.value;
        wrqu->sens.fixed = 1;
        return 0;
}

static int wl3501_get_range(struct net_device *dev,
                            struct iw_request_info *info,
                            union iwreq_data *wrqu, char *extra)
{
        struct iw_range *range = (struct iw_range *)extra;

        /* Set the length (very important for backward compatibility) */
        wrqu->data.length = sizeof(*range);

        /* Set all the info we don't care or don't know about to zero */
        memset(range, 0, sizeof(*range));

        /* Set the Wireless Extension versions */
        range->we_version_compiled      = WIRELESS_EXT;
        range->we_version_source        = 1;
        range->throughput               = 2 * 1000 * 1000;     /* ~2 Mb/s */
        /* FIXME: study the code to fill in more fields... */
        return 0;
}

static int wl3501_set_wap(struct net_device *dev, struct iw_request_info *info,
                          union iwreq_data *wrqu, char *extra)
{
        struct wl3501_card *this = netdev_priv(dev);
        static const u8 bcast[ETH_ALEN] = { 255, 255, 255, 255, 255, 255 };
        int rc = -EINVAL;

        /* FIXME: we support other ARPHRDs...*/
        if (wrqu->ap_addr.sa_family != ARPHRD_ETHER)
                goto out;
        if (!memcmp(bcast, wrqu->ap_addr.sa_data, ETH_ALEN)) {
                /* FIXME: rescan? */
        } else
                memcpy(this->bssid, wrqu->ap_addr.sa_data, ETH_ALEN);
                /* FIXME: rescan? deassoc & scan? */
        rc = 0;
out:
        return rc;
}

static int wl3501_get_wap(struct net_device *dev, struct iw_request_info *info,
                          union iwreq_data *wrqu, char *extra)
{
        struct wl3501_card *this = netdev_priv(dev);

        wrqu->ap_addr.sa_family = ARPHRD_ETHER;
        memcpy(wrqu->ap_addr.sa_data, this->bssid, ETH_ALEN);
        return 0;
}

static int wl3501_set_scan(struct net_device *dev, struct iw_request_info *info,
                           union iwreq_data *wrqu, char *extra)
{
        /*
         * FIXME: trigger scanning with a reset, yes, I'm lazy
         */
        return wl3501_reset(dev);
}

static int wl3501_get_scan(struct net_device *dev, struct iw_request_info *info,
                           union iwreq_data *wrqu, char *extra)
{
        struct wl3501_card *this = netdev_priv(dev);
        int i;
        char *current_ev = extra;
        struct iw_event iwe;

        for (i = 0; i < this->bss_cnt; ++i) {
                iwe.cmd                 = SIOCGIWAP;
                iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
                memcpy(iwe.u.ap_addr.sa_data, this->bss_set[i].bssid, ETH_ALEN);
                current_ev = iwe_stream_add_event(info, current_ev,
                                                  extra + IW_SCAN_MAX_DATA,
                                                  &iwe, IW_EV_ADDR_LEN);
                iwe.cmd           = SIOCGIWESSID;
                iwe.u.data.flags  = 1;
                iwe.u.data.length = this->bss_set[i].ssid.el.len;
                current_ev = iwe_stream_add_point(info, current_ev,
                                                  extra + IW_SCAN_MAX_DATA,
                                                  &iwe,
                                                  this->bss_set[i].ssid.essid);
                iwe.cmd    = SIOCGIWMODE;
                iwe.u.mode = this->bss_set[i].bss_type;
                current_ev = iwe_stream_add_event(info, current_ev,
                                                  extra + IW_SCAN_MAX_DATA,
                                                  &iwe, IW_EV_UINT_LEN);
                iwe.cmd = SIOCGIWFREQ;
                iwe.u.freq.m = this->bss_set[i].ds_pset.chan;
                iwe.u.freq.e = 0;
                current_ev = iwe_stream_add_event(info, current_ev,
                                                  extra + IW_SCAN_MAX_DATA,
                                                  &iwe, IW_EV_FREQ_LEN);
                iwe.cmd = SIOCGIWENCODE;
                if (this->bss_set[i].cap_info & WL3501_MGMT_CAPABILITY_PRIVACY)
                        iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
                else
                        iwe.u.data.flags = IW_ENCODE_DISABLED;
                iwe.u.data.length = 0;
                current_ev = iwe_stream_add_point(info, current_ev,
                                                  extra + IW_SCAN_MAX_DATA,
                                                  &iwe, NULL);
        }
        /* Length of data */
        wrqu->data.length = (current_ev - extra);
        wrqu->data.flags = 0; /* FIXME: set properly these flags */
        return 0;
}

static int wl3501_set_essid(struct net_device *dev,
                            struct iw_request_info *info,
                            union iwreq_data *wrqu, char *extra)
{
        struct wl3501_card *this = netdev_priv(dev);

        if (wrqu->data.flags) {
                iw_set_mgmt_info_element(IW_MGMT_INFO_ELEMENT_SSID,
                                         &this->essid.el,
                                         extra, wrqu->data.length);
        } else { /* We accept any ESSID */
                iw_set_mgmt_info_element(IW_MGMT_INFO_ELEMENT_SSID,
                                         &this->essid.el, "ANY", 3);
        }
        return wl3501_reset(dev);
}

static int wl3501_get_essid(struct net_device *dev,
                            struct iw_request_info *info,
                            union iwreq_data *wrqu, char *extra)
{
        struct wl3501_card *this = netdev_priv(dev);
        unsigned long flags;

        spin_lock_irqsave(&this->lock, flags);
        wrqu->essid.flags  = 1;
        wrqu->essid.length = this->essid.el.len;
        memcpy(extra, this->essid.essid, this->essid.el.len);
        spin_unlock_irqrestore(&this->lock, flags);
        return 0;
}

static int wl3501_set_nick(struct net_device *dev, struct iw_request_info *info,
                           union iwreq_data *wrqu, char *extra)
{
        struct wl3501_card *this = netdev_priv(dev);

        if (wrqu->data.length > sizeof(this->nick))
                return -E2BIG;
        strlcpy(this->nick, extra, wrqu->data.length);
        return 0;
}

static int wl3501_get_nick(struct net_device *dev, struct iw_request_info *info,
                           union iwreq_data *wrqu, char *extra)
{
        struct wl3501_card *this = netdev_priv(dev);

        strlcpy(extra, this->nick, 32);
        wrqu->data.length = strlen(extra);
        return 0;
}

static int wl3501_get_rate(struct net_device *dev, struct iw_request_info *info,
                           union iwreq_data *wrqu, char *extra)
{
        /*
         * FIXME: have to see from where to get this info, perhaps this card
         * works at 1 Mbit/s too... for now leave at 2 Mbit/s that is the most
         * common with the Planet Access Points. -acme
         */
        wrqu->bitrate.value = 2000000;
        wrqu->bitrate.fixed = 1;
        return 0;
}

static int wl3501_get_rts_threshold(struct net_device *dev,
                                    struct iw_request_info *info,
                                    union iwreq_data *wrqu, char *extra)
{
        u16 threshold; /* size checked: it is u16 */
        struct wl3501_card *this = netdev_priv(dev);
        int rc = wl3501_get_mib_value(this, WL3501_MIB_ATTR_RTS_THRESHOLD,
                                      &threshold, sizeof(threshold));
        if (!rc) {
                wrqu->rts.value = threshold;
                wrqu->rts.disabled = threshold >= 2347;
                wrqu->rts.fixed = 1;
        }
        return rc;
}

static int wl3501_get_frag_threshold(struct net_device *dev,
                                     struct iw_request_info *info,
                                     union iwreq_data *wrqu, char *extra)
{
        u16 threshold; /* size checked: it is u16 */
        struct wl3501_card *this = netdev_priv(dev);
        int rc = wl3501_get_mib_value(this, WL3501_MIB_ATTR_FRAG_THRESHOLD,
                                      &threshold, sizeof(threshold));
        if (!rc) {
                wrqu->frag.value = threshold;
                wrqu->frag.disabled = threshold >= 2346;
                wrqu->frag.fixed = 1;
        }
        return rc;
}

static int wl3501_get_txpow(struct net_device *dev,
                            struct iw_request_info *info,
                            union iwreq_data *wrqu, char *extra)
{
        u16 txpow;
        struct wl3501_card *this = netdev_priv(dev);
        int rc = wl3501_get_mib_value(this,
                                      WL3501_MIB_ATTR_CURRENT_TX_PWR_LEVEL,
                                      &txpow, sizeof(txpow));
        if (!rc) {
                wrqu->txpower.value = txpow;
                wrqu->txpower.disabled = 0;
                /*
                 * From the MIB values I think this can be configurable,
                 * as it lists several tx power levels -acme
                 */
                wrqu->txpower.fixed = 0;
                wrqu->txpower.flags = IW_TXPOW_MWATT;
        }
        return rc;
}

static int wl3501_get_retry(struct net_device *dev,
                            struct iw_request_info *info,
                            union iwreq_data *wrqu, char *extra)
{
        u8 retry; /* size checked: it is u8 */
        struct wl3501_card *this = netdev_priv(dev);
        int rc = wl3501_get_mib_value(this,
                                      WL3501_MIB_ATTR_LONG_RETRY_LIMIT,
                                      &retry, sizeof(retry));
        if (rc)
                goto out;
        if (wrqu->retry.flags & IW_RETRY_LONG) {
                wrqu->retry.flags = IW_RETRY_LIMIT | IW_RETRY_LONG;
                goto set_value;
        }
        rc = wl3501_get_mib_value(this, WL3501_MIB_ATTR_SHORT_RETRY_LIMIT,
                                  &retry, sizeof(retry));
        if (rc)
                goto out;
        wrqu->retry.flags = IW_RETRY_LIMIT | IW_RETRY_SHORT;
set_value:
        wrqu->retry.value = retry;
        wrqu->retry.disabled = 0;
out:
        return rc;
}

static int wl3501_get_encode(struct net_device *dev,
                             struct iw_request_info *info,
                             union iwreq_data *wrqu, char *extra)
{
        u8 implemented, restricted, keys[100], len_keys, tocopy;
        struct wl3501_card *this = netdev_priv(dev);
        int rc = wl3501_get_mib_value(this,
                                      WL3501_MIB_ATTR_PRIV_OPT_IMPLEMENTED,
                                      &implemented, sizeof(implemented));
        if (rc)
                goto out;
        if (!implemented) {
                wrqu->encoding.flags = IW_ENCODE_DISABLED;
                goto out;
        }
        rc = wl3501_get_mib_value(this, WL3501_MIB_ATTR_EXCLUDE_UNENCRYPTED,
                                  &restricted, sizeof(restricted));
        if (rc)
                goto out;
        wrqu->encoding.flags = restricted ? IW_ENCODE_RESTRICTED :
                                            IW_ENCODE_OPEN;
        rc = wl3501_get_mib_value(this, WL3501_MIB_ATTR_WEP_KEY_MAPPINGS_LEN,
                                  &len_keys, sizeof(len_keys));
        if (rc)
                goto out;
        rc = wl3501_get_mib_value(this, WL3501_MIB_ATTR_WEP_KEY_MAPPINGS,
                                  keys, len_keys);
        if (rc)
                goto out;
        tocopy = min_t(u8, len_keys, wrqu->encoding.length);
        tocopy = min_t(u8, tocopy, 100);
        wrqu->encoding.length = tocopy;
        memcpy(extra, keys, tocopy);
out:
        return rc;
}

static int wl3501_get_power(struct net_device *dev,
                            struct iw_request_info *info,
                            union iwreq_data *wrqu, char *extra)
{
        u8 pwr_state;
        struct wl3501_card *this = netdev_priv(dev);
        int rc = wl3501_get_mib_value(this,
                                      WL3501_MIB_ATTR_CURRENT_PWR_STATE,
                                      &pwr_state, sizeof(pwr_state));
        if (rc)
                goto out;
        wrqu->power.disabled = !pwr_state;
        wrqu->power.flags = IW_POWER_ON;
out:
        return rc;
}

static const iw_handler wl3501_handler[] = {
        IW_HANDLER(SIOCGIWNAME, wl3501_get_name),
        IW_HANDLER(SIOCSIWFREQ, wl3501_set_freq),
        IW_HANDLER(SIOCGIWFREQ, wl3501_get_freq),
        IW_HANDLER(SIOCSIWMODE, wl3501_set_mode),
        IW_HANDLER(SIOCGIWMODE, wl3501_get_mode),
        IW_HANDLER(SIOCGIWSENS, wl3501_get_sens),
        IW_HANDLER(SIOCGIWRANGE, wl3501_get_range),
        IW_HANDLER(SIOCSIWSPY, iw_handler_set_spy),
        IW_HANDLER(SIOCGIWSPY, iw_handler_get_spy),
        IW_HANDLER(SIOCSIWTHRSPY, iw_handler_set_thrspy),
        IW_HANDLER(SIOCGIWTHRSPY, iw_handler_get_thrspy),
        IW_HANDLER(SIOCSIWAP, wl3501_set_wap),
        IW_HANDLER(SIOCGIWAP, wl3501_get_wap),
        IW_HANDLER(SIOCSIWSCAN, wl3501_set_scan),
        IW_HANDLER(SIOCGIWSCAN, wl3501_get_scan),
        IW_HANDLER(SIOCSIWESSID, wl3501_set_essid),
        IW_HANDLER(SIOCGIWESSID, wl3501_get_essid),
        IW_HANDLER(SIOCSIWNICKN, wl3501_set_nick),
        IW_HANDLER(SIOCGIWNICKN, wl3501_get_nick),
        IW_HANDLER(SIOCGIWRATE, wl3501_get_rate),
        IW_HANDLER(SIOCGIWRTS, wl3501_get_rts_threshold),
        IW_HANDLER(SIOCGIWFRAG, wl3501_get_frag_threshold),
        IW_HANDLER(SIOCGIWTXPOW, wl3501_get_txpow),
        IW_HANDLER(SIOCGIWRETRY, wl3501_get_retry),
        IW_HANDLER(SIOCGIWENCODE, wl3501_get_encode),
        IW_HANDLER(SIOCGIWPOWER, wl3501_get_power),
};

static const struct iw_handler_def wl3501_handler_def = {
        .num_standard   = ARRAY_SIZE(wl3501_handler),
        .standard       = (iw_handler *)wl3501_handler,
        .get_wireless_stats = wl3501_get_wireless_stats,
};

static const struct net_device_ops wl3501_netdev_ops = {
        .ndo_open               = wl3501_open,
        .ndo_stop               = wl3501_close,
        .ndo_start_xmit         = wl3501_hard_start_xmit,
        .ndo_tx_timeout         = wl3501_tx_timeout,
        .ndo_change_mtu         = eth_change_mtu,
        .ndo_set_mac_address    = eth_mac_addr,
        .ndo_validate_addr      = eth_validate_addr,
};

static int wl3501_probe(struct pcmcia_device *p_dev)
{
        struct net_device *dev;
        struct wl3501_card *this;

        /* The io structure describes IO port mapping */
        p_dev->resource[0]->end = 16;
        p_dev->resource[0]->flags       = IO_DATA_PATH_WIDTH_8;

        /* General socket configuration */
        p_dev->config_flags     = CONF_ENABLE_IRQ;
        p_dev->config_index     = 1;

        dev = alloc_etherdev(sizeof(struct wl3501_card));
        if (!dev)
                goto out_link;


        dev->netdev_ops         = &wl3501_netdev_ops;
        dev->watchdog_timeo     = 5 * HZ;

        this = netdev_priv(dev);
        this->wireless_data.spy_data = &this->spy_data;
        this->p_dev = p_dev;
        dev->wireless_data      = &this->wireless_data;
        dev->wireless_handlers  = &wl3501_handler_def;
        netif_stop_queue(dev);
        p_dev->priv = dev;

        return wl3501_config(p_dev);
out_link:
        return -ENOMEM;
}

static int wl3501_config(struct pcmcia_device *link)
{
        struct net_device *dev = link->priv;
        int i = 0, j, ret;
        struct wl3501_card *this;

        /* Try allocating IO ports.  This tries a few fixed addresses.  If you
         * want, you can also read the card's config table to pick addresses --
         * see the serial driver for an example. */
        link->io_lines = 5;

        for (j = 0x280; j < 0x400; j += 0x20) {
                /* The '^0x300' is so that we probe 0x300-0x3ff first, then
                 * 0x200-0x2ff, and so on, because this seems safer */
                link->resource[0]->start = j;
                link->resource[1]->start = link->resource[0]->start + 0x10;
                i = pcmcia_request_io(link);
                if (i == 0)
                        break;
        }
        if (i != 0)
                goto failed;

        /* Now allocate an interrupt line. Note that this does not actually
         * assign a handler to the interrupt. */

        ret = pcmcia_request_irq(link, wl3501_interrupt);
        if (ret)
                goto failed;

        ret = pcmcia_enable_device(link);
        if (ret)
                goto failed;

        dev->irq = link->irq;
        dev->base_addr = link->resource[0]->start;
        SET_NETDEV_DEV(dev, &link->dev);
        if (register_netdev(dev)) {
                printk(KERN_NOTICE "wl3501_cs: register_netdev() failed\n");
                goto failed;
        }

        this = netdev_priv(dev);

        this->base_addr = dev->base_addr;

        if (!wl3501_get_flash_mac_addr(this)) {
                printk(KERN_WARNING "%s: Cant read MAC addr in flash ROM?\n",
                       dev->name);
                unregister_netdev(dev);
                goto failed;
        }

        for (i = 0; i < 6; i++)
                dev->dev_addr[i] = ((char *)&this->mac_addr)[i];

        /* print probe information */
        printk(KERN_INFO "%s: wl3501 @ 0x%3.3x, IRQ %d, "
               "MAC addr in flash ROM:%pM\n",
               dev->name, this->base_addr, (int)dev->irq,
               dev->dev_addr);
        /*
         * Initialize card parameters - added by jss
         */
        this->net_type          = IW_MODE_INFRA;
        this->bss_cnt           = 0;
        this->join_sta_bss      = 0;
        this->adhoc_times       = 0;
        iw_set_mgmt_info_element(IW_MGMT_INFO_ELEMENT_SSID, &this->essid.el,
                                 "ANY", 3);
        this->card_name[0]      = '\0';
        this->firmware_date[0]  = '\0';
        this->rssi              = 255;
        this->chan              = iw_default_channel(this->reg_domain);
        strlcpy(this->nick, "Planet WL3501", sizeof(this->nick));
        spin_lock_init(&this->lock);
        init_waitqueue_head(&this->wait);
        netif_start_queue(dev);
        return 0;

failed:
        wl3501_release(link);
        return -ENODEV;
}

static void wl3501_release(struct pcmcia_device *link)
{
        pcmcia_disable_device(link);
}

static int wl3501_suspend(struct pcmcia_device *link)
{
        struct net_device *dev = link->priv;

        wl3501_pwr_mgmt(netdev_priv(dev), WL3501_SUSPEND);
        if (link->open)
                netif_device_detach(dev);

        return 0;
}

static int wl3501_resume(struct pcmcia_device *link)
{
        struct net_device *dev = link->priv;

        wl3501_pwr_mgmt(netdev_priv(dev), WL3501_RESUME);
        if (link->open) {
                wl3501_reset(dev);
                netif_device_attach(dev);
        }

        return 0;
}

static struct pcmcia_device_id wl3501_ids[] = {
        PCMCIA_DEVICE_MANF_CARD(0xd601, 0x0001),
        PCMCIA_DEVICE_NULL
};
MODULE_DEVICE_TABLE(pcmcia, wl3501_ids);

static struct pcmcia_driver wl3501_driver = {
        .owner          = THIS_MODULE,
        .name           = "wl3501_cs",
        .probe          = wl3501_probe,
        .remove         = wl3501_detach,
        .id_table       = wl3501_ids,
        .suspend        = wl3501_suspend,
        .resume         = wl3501_resume,
};

static int __init wl3501_init_module(void)
{
        return pcmcia_register_driver(&wl3501_driver);
}

static void __exit wl3501_exit_module(void)
{
        pcmcia_unregister_driver(&wl3501_driver);
}

module_init(wl3501_init_module);
module_exit(wl3501_exit_module);

MODULE_AUTHOR("Fox Chen <mhchen@golf.ccl.itri.org.tw>, "
              "Arnaldo Carvalho de Melo <acme@conectiva.com.br>,"
              "Gustavo Niemeyer <niemeyer@conectiva.com>");
MODULE_DESCRIPTION("Planet wl3501 wireless driver");
MODULE_LICENSE("GPL");